STLC3080 STMicroelectronics, STLC3080 Datasheet - Page 8

• Manufacturer Part Number: STLC3080
• Description: IC INTERFACE LINE SUBSCRB 44TQFP
• Manufacturer: STMicroelectronics

Specifications of STLC3080

• Function: Subscriber Line Interface Concept (SLIC)
• Number Of Circuits: 1
• Voltage - Supply: 4.75 V ~ 5.25 V
• Current - Supply: 5.5mA
• Power (watts): 1.1W
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 44-LQFP
• Includes: Automatic Activation Mode, BORSCHT Functions, Ring Trip Detection, Slave Mode
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Interface: -

STLC3080
When a fault is detected the line current is limited
in order to avoid any damage on the device itself
and also on the external transistor.
MISCELLANEOUS
- Thermal overload: the integrated thermal pro-
- One low cost external transistor allows to re-
- The SLIC supports loop start lines and gives
EXTERNAL COMPONENTS
8/23
tection is activated when Tj reaches 150°C typ.;
the Slic is forced in Power-down mode, DET
and AL are set Low. The RELR relay driver is
turned off while it is still possible to control
REL0 and REL1 through R0 and R1 inputs.
duce the power dissipated in the SLIC itself al-
lowing the use of extreme small size package
(TQFP44). The external transistor size/package
can be selected depending on the max. power
requested by the particular application.
the possibility to set loop current indicator
threshold by means of one external resistor.
R
CVCC
C
Name
RPR1
RPT1
CVB
C
Q
REF
ZAC
RS1
RS2
R
C
C
RR
COMP
RT
ZA
ZB
R
SVR
EXT
RT
DC
AC
S
(*)
Positive Supply Filter
Battery Supply Filter
Internal current reference
programming resistor
Battery ripple rejection capacitance
Ring Trip capacitance
DC sinthesized resistance
programming resistor
AC/DC splitter capacitance
Protection resistor image
2 wire AC impedance
SLIC impedance balancing network
Line impedance balancing network
AC feedback compensation
capacitance
Feeding resistance for Ring Injection
Sensing resistor for Ring Trip
Sensing resistor for Ring Trip
Feeding resistance for Ring Injection
External transistor
Line series resistor
Line series resistor
Function
I
C
C
C
REF
see Appendix D
R
R
R
Z
ZA = 25 Zs
ZB = 25 Zl
1000 RR
1000 RR
(1)
SVR
AC
COMP
400
0
20
20
AC
DC
DC
S
= 25 2Rp
= 25[Zs - 2Rp]
= 5[R
R
2
1.16
EXTERNAL COMPONENTS LIST
To set the SLIC into operation the following pa-
rameters have to be defined:
Once, the above parameters are defined, it is
possible to calculate all the external components
using the following table.
1k
2
REF
2
- The DC feeding resistance "Rfeed" defined as
- The AC SLIC impedance at line terminals "Zs"
- The equivalent AC impedance of the line "Zl"
- The value of the two protection resistors Rp in
- The reverse polarity transition time defined as
- The constant current limit value "I
- Rth: sets the OFF/Hook DETection threshold
fsp R
feed
the resistance of the traditional feeding sys-
tem (most common Rfeed values are: 400,
800, 1000 ohm).
to which the return loss measurements is re-
ferred. It can be real (typ. 600 ohm) or com-
plex.
used for evaluation of the trans-hybrid loss
performance (2/4wire conversion). It can be a
complex impedance.
series with the line termination.
" V
fp 1.3M
1
fo
Formula
1
-2Rp]
[100
TR
2
DC
/ T".
Rp]
100nF 20%
100nF 20% 100V
30.1k
100nF 10% 100V
@ fp = 1.22Hz
470nF 20% 6V
@ 25Hz
1.5k
10 F 20% 15V
@ fsp = 10Hz
2.5k
12.5k
15k
15k
220pF 20%
@ fo = 250kHz
600
600k
600k
0
BD140, MJD32
20
Typical Value
1/4W
2W
1%
1%
1%
1%
1%
1%
1%
1%
lim
1%
".